[hbossy]

I bet it's an inside joke, like Lenna.jpeg. Some outdated / test / dead-end, or otherwise harmless project put there as a wink to everyone involved in the industry. Maybe it's something an intern ruined on his first day and made entire lab work on for three weeks without realizing?

[taneq]

That was my first guess, that this picture is in the first page of image search results for "nuclear detonator" or whatever.